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Security report for denys.com

Denys · Energy · Belgium

Medium risk. 5 critical or high findings in Security headers, SSL/TLS and 1 other check.

Security score

58/100

Risk levelMedium

0–100, higher is better. How it is calculated

Denys is a well-established multidisciplinary construction and infrastructure company based in Belgium, specializing in complex projects across water, energy, mobility, building construction, restoration, and tunnelling. The company serves clients primarily in Europe and Africa, positioning itself as a trusted partner for large-scale and technically challenging projects. The website reflects a mature digital presence with detailed project descriptions, structured data, and integration of modern web technologies such as Google Analytics and Google Maps API. Security posture is adequate with HTTPS and anonymized analytics, but lacks explicit security headers and formal privacy or cookie policies. The absence of WHOIS data for the domain is a notable concern, potentially indicating privacy protection or registration issues, which slightly impacts trustworthiness. Overall, the site is professional, content-rich, and business-focused, but would benefit from enhanced transparency in privacy and security policies.

Scanned

NIS2 and GDPR posture

GDPR outside view
83/ 100 · Low
Checks completed
7of 7

NIS2 Art. 21(2)

  1. (a) Risk analysis and security policies: Not visible from outside
  2. (b) Incident handling: One indicator
  3. (c) Business continuity, backups and crisis management: Not visible from outside
  4. (d) Supply chain security: Not visible from outside
  5. (e) Secure acquisition, development and maintenance, including vulnerability handling: Partly checked
  6. (f) Assessing the effectiveness of security measures: Not visible from outside
  7. (g) Cyber hygiene and security training: Not visible from outside
  8. (h) Cryptography and encryption: Partly checked
  9. (i) HR security, access control and asset management: One indicator
  10. (j) Multi-factor authentication and secured communications: Not visible from outside

This scan rated NIS2 with an earlier keyword method that is no longer shown; rescan for the per-article view. Risk management, continuity, supply chain, training, MFA, management oversight (Art. 20) and incident reporting (Art. 23) need internal evidence, and Guard cannot tell whether NIS2 applies to this organisation.

GDPR is indicative only, based on publicly visible signals: Articles 7, 12, 13 and 32 of Regulation (EU) 2016/679 and Article 5(3) of the ePrivacy Directive. Not a certification or legal assessment.

Priority findings

5 findings rated critical or high. Fix these first.

  1. Security headers

    Security headers are instructions your web server sends to every visitor’s browser. Missing ones leave visitors more exposed to attacks such as clickjacking and injected scripts.

    • High

      Missing Strict-Transport-Security header

      Forces HTTPS connections

      What to do: Add "Strict-Transport-Security: max-age=31536000; includeSubDomains; preload"

      • CWE-319
      • OWASP A04:2025
      • ASVS V3.4.1
    • High

      Missing X-Frame-Options header

      Prevents clickjacking attacks

      What to do: Add "X-Frame-Options: DENY" or "X-Frame-Options: SAMEORIGIN"

    • High

      Missing Content-Security-Policy header

      Controls resources the browser is allowed to load

      What to do: Implement a Content-Security-Policy appropriate for your application

      • ASVS V3.4.3
      • OWASP Secure Headers: OWASP Secure Headers Project recommends Content-Security-Policy: default-src 'self'; form-action 'self'; base-uri 'self'; object-src 'none';…

  2. SSL/TLS

    TLS encrypts the connection and proves the site is really yours. Weak or expiring certificates trigger browser warnings and put traffic at risk.

    • High

      Weak Protocols Supported

      Server supports weak protocols: TLSv1.1

      What to do: Disable TLS 1.0, TLS 1.1, and all SSL versions

      • CWE-327
      • OWASP A04:2025
      • ASVS V12.1.1

  3. Network security

    Services reachable from the internet are the first thing attackers probe. Anything open that does not need to be should be closed.

    • High

      High-Risk Service Exposed: FTP

      Port 21 (FTP) is publicly accessible - FTP - Often unencrypted file transfer

      What to do: Consider restricting access to FTP or implementing strong authentication

      • NIS2 21(2)(e)
      • IR 2024/2690 6.7.2(f): Implementing Regulation (EU) 2024/2690, Annex point 6.7.2(f): Network security
      • NIST CM-7: NIST SP 800-53 Rev. 5 CM-7: Least Functionality
      • NIST SC-7: NIST SP 800-53 Rev. 5 SC-7: Boundary Protection

Need hands-on remediation? Email guard@offseq.com

Keep watching denys.com

This scan found 23 issues across 6 checks. Monitoring re-runs those checks daily, emails you when something material changes and records each fix, so you can show progress.

Daily monitoring

Recommended

€25per month

  • TLS certificates and expiry
  • DNS records
  • SPF, DKIM and DMARC
  • Security headers
  • GDPR and NIS2 posture
  • Exposed services
  • Third-party trackers
  • Security score drift

Email alerts on material changes and an exportable JSON history of every change.

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Results by check

Each check with its score, findings and the evidence it collected.

How this score is calculated

The security score runs 0–100, higher is better. It is the plain average of the security checks that completed in this scan, each counted equally. A check that could not run is left out: it counts neither as a pass nor as a fail.

Counted in this score

SSL/TLS
72
Security headers
20
Email security
70
DNS health
80
Network security
20
GDPR outside view
83
Average
58

Not counted

  • NIS2 outside view: Re-weights evidence from the TLS, email, DNS, network and hygiene checks, so counting it would count that evidence twice. Shown on its own.
  • OffSeq Observations: An AI reading of the site, useful context but not reproducible evidence. Shown on its own.

Findings that cap the score at 49

Each of these is serious on its own, so while any is present the site cannot rate better than high risk, however good the other checks are.

  • The certificate is not trusted by browsers
  • The website is not served over HTTPS
  • A database, remote desktop, file-sharing or Telnet service is reachable from the internet
  • The page loads a script from a compromised source
  • The domain registration has expired
  • SPF authorises every server to send mail as the domain

Partial scans

When the site blocks Guard or most checks cannot run, the score covers only the checks that ran (usually DNS and email), is capped at 75 and is shown as partial, without a risk level.

Risk levels

  • Critical0–25
  • High26–49
  • Medium50–75
  • Low76–100

Technical appendix

Business context, site observations and technical notes gathered during the scan, and the standards behind each reference.

Business context

Business profile

Denys operates in the energy, transport, and real estate sectors with a diversified service portfolio including water infrastructure, energy pipelines, mobility infrastructure, and restoration. The company has a long history dating back to 1923, indicating deep industry experience. Its market position is strong, supported by a broad geographic footprint and a multidisciplinary approach. The business model focuses on providing end-to-end construction and maintenance solutions, leveraging technological innovation and specialized techniques. The presence of a dedicated HR platform suggests active recruitment and growth. The company’s partnership ecosystem includes technology providers and industry associations, enhancing its competitive advantage. Revenue streams likely derive from public and private sector contracts in infrastructure and construction projects.

Security posture

The website employs HTTPS with a valid SSL certificate and uses Google Analytics with IP anonymization, reflecting basic security hygiene. However, the lack of security headers such as Content-Security-Policy, X-Frame-Options, and X-XSS-Protection reduces the overall security posture. No explicit security or incident response policies are published, and no vulnerability disclosure or security.txt files are found. The absence of privacy and cookie policies also indicates gaps in compliance with GDPR and related regulations. No exposed sensitive data or vulnerable libraries were detected in the provided content. The security score is moderate, with recommendations to implement security headers, publish privacy and cookie policies, and establish incident response and vulnerability disclosure mechanisms to enhance trust and compliance.

Recommendations

  1. Implement comprehensive privacy and cookie policies with user consent mechanisms to improve GDPR compliance.
  2. Add security headers such as Content-Security-Policy, X-Frame-Options, and X-XSS-Protection to strengthen website security.
  3. Publish a security incident response policy and vulnerability disclosure program to demonstrate proactive security management.
  4. Verify and update WHOIS domain registration information to improve transparency and trustworthiness.
  5. Enhance accessibility features and conduct regular security audits to maintain a robust security posture.

Contact details published on the site

Addresses
Legal name
Denys NV
Site observations

Automated reading of the public site. Ratings are indicative.

Business

Company
Denys
Description
Denys NV is ervaren in complexe bouwprojecten & infrastructuurwerken op vlak van water, energie, mobiliteit, bouwkunde, restauratie & meer. Ontdek hier alles over onze multidisciplinaire groep.
Key services
water infrastructure, energy pipelines, mobility infrastructure, building construction, restoration and renovation, tunnelling, special foundation and injection techniques
Content quality
excellent
Branding
consistent

Technology

Stack
Google Analytics, Google Tag Manager, Google Maps API, Slick Carousel, WebFont Loader, SEOmatic
Performance
moderate
Mobile
good
Accessibility
basic
SEO
good

Security

Observed score
80/100
Good practices seen
  • HTTPS enabled
  • IP anonymization in Google Analytics

Analytics and tracking

Services
Google Analytics
Tracking level
moderate
Privacy practices
basic

Advertising

Transparency
basic

Site quality

Design
excellent
User experience
excellent
Content relevance
excellent
Navigation
excellent
Professionalism
excellent
Trustworthiness
high

Key observations

  1. Website is fully accessible with rich content and structured data
  2. No privacy or cookie policy pages detected
  3. No explicit security or incident response policies found
  4. WHOIS data is missing or unavailable, which is a concern
  5. Website uses modern web technologies and analytics
  6. Contact information is clearly presented in structured data
  7. No suspicious or malicious content detected
Technical notes

Notes

The website uses a modern tech stack including Google Analytics, Google Tag Manager, Google Maps API, and Slick Carousel for UI components. Fonts are loaded via Google Fonts and WebFont Loader. The site is mobile responsive with good navigation clarity and SEO optimization through meta tags and structured data (JSON-LD). Performance is moderate, with potential improvements in loading speed and accessibility. No CMS is explicitly detected, suggesting a custom or proprietary platform. Hosting provider details are not available from the provided data. The site integrates multiple external scripts and APIs, which should be monitored for security and performance impacts. Overall, the technical infrastructure supports a professional and user-friendly experience but could benefit from enhanced security configurations and privacy features.
Standards and sources

Reference chips under each finding point to the standard, regulation or specification the finding relates to. They are taken from the official datasets below and mapped conservatively: a finding with no defensible link shows none. NIS2 and GDPR references mark where a finding is relevant evidence, not a compliance verdict. Implementing Regulation (EU) 2024/2690 binds digital infrastructure and digital service providers; for other entities it is the most detailed public reading of the Article 21 measures. WCAG, EN 301 549, European Accessibility Act and Web Accessibility Directive references name the requirement an automated accessibility rule relates to; they are not a conformance verdict.

Retrieved 2026-10-25

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